rockchip: back-to-bootrom: split BACK_TO_BOOTROM for TPL/SPL

The back-to-bootrom option is rather unfortunately named
  CONFIG_ROCKCHIP_SPL_BACK_TO_BOOTROM
instead of
  CONFIG_SPL_ROCKCHIP_BACK_TO_BOOTROM

To make is selectable through CONFIG_IS_ENABLED(ROCKCHIP_BACK_TO_BOOTROM),
we need to rename it.  At the same time, we introduce a TPL_ variant of
the option to give us finer-grained control over when it should be used.

This change is motivated by our RK3368 boot process, which returns to
the boot ROM only from the TPL stage, but not from the SPL stage.

Signed-off-by: Philipp Tomsich <philipp.tomsich@theobroma-systems.com>
[added fix-up for evb-rk3229_defconfig and phycore-rk3288_defconfig:]
[fixed inverted CONFIG_IS_ENABLED test for rk3288:]
Signed-off-by: Philipp Tomsich <philipp.tomsich@theobroma-systems.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Tom Rini <trini@konsulko.com>

include/configs/rock.h: undef
diff --git a/include/configs/rk3188_common.h b/include/configs/rk3188_common.h
index 3ee9abd..8a01936 100644
--- a/include/configs/rk3188_common.h
+++ b/include/configs/rk3188_common.h
@@ -26,7 +26,7 @@
 
 #define CONFIG_SYS_NS16550_MEM32
 
-#ifdef CONFIG_ROCKCHIP_SPL_BACK_TO_BROM
+#ifdef CONFIG_SPL_ROCKCHIP_BACK_TO_BROM
 /* Bootrom will load u-boot binary to 0x60000000 once return from SPL */
 #define CONFIG_SYS_TEXT_BASE		0x60000000
 #else
diff --git a/include/configs/rk3288_common.h b/include/configs/rk3288_common.h
index 488d679..ade6caf 100644
--- a/include/configs/rk3288_common.h
+++ b/include/configs/rk3288_common.h
@@ -24,7 +24,7 @@
 #define CONFIG_SPL_FRAMEWORK
 #define CONFIG_SYS_NS16550_MEM32
 
-#ifdef CONFIG_ROCKCHIP_SPL_BACK_TO_BROM
+#ifdef CONFIG_SPL_ROCKCHIP_BACK_TO_BROM
 /* Bootrom will load u-boot binary to 0x0 once return from SPL */
 #define CONFIG_SYS_TEXT_BASE		0x00000000
 #else
diff --git a/include/configs/rock.h b/include/configs/rock.h
index e998ec5..6b0788b 100644
--- a/include/configs/rock.h
+++ b/include/configs/rock.h
@@ -12,7 +12,7 @@
 
 #define CONFIG_SYS_MMC_ENV_DEV 0
 
-#ifdef CONFIG_ROCKCHIP_SPL_BACK_TO_BROM
+#if defined(ROCKCHIP_BACK_TO_BROM)
 /* SPL @ 32k for 34k
  * u-boot directly after @ 68k for 400k or so
  * ENV @ 992k
diff --git a/include/configs/rockchip-common.h b/include/configs/rockchip-common.h
index 29a492d..b3986c2 100644
--- a/include/configs/rockchip-common.h
+++ b/include/configs/rockchip-common.h
@@ -46,7 +46,7 @@
 
 #endif
 
-#ifdef CONFIG_ROCKCHIP_SPL_BACK_TO_BROM
+#if CONFIG_IS_ENABLED(ROCKCHIP_BACK_TO_BROM)
 /* SPL @ 32k for 34k
  * u-boot directly after @ 68k for 400k or so
  * ENV @ 992k