rockchip: rk3188: rock: adjust for SPL/TPL split

With the changes to split SPL/TPL for the RK3368, I apparently missed
some needed adjustments to the RK3188 Kconfig and rock_defconfig.

This fixes build-issues for the rock board after applying the RK3368
enablement (and SPL/TPL) set that resulted from TPL_SERIAL_SUPPORT,
TPL_ROCKCHIP_BACK_TO_BROM and TPL_TINY_MEMSET being separate symbols
now.

Signed-off-by: Philipp Tomsich <philipp.tomsich@theobroma-systems.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
diff --git a/configs/rock_defconfig b/configs/rock_defconfig
index 101b159..eae284c 100644
--- a/configs/rock_defconfig
+++ b/configs/rock_defconfig
@@ -5,6 +5,7 @@
 CONFIG_SYS_MALLOC_F_LEN=0x2000
 CONFIG_ROCKCHIP_RK3188=y
 CONFIG_SPL_ROCKCHIP_BACK_TO_BROM=y
+CONFIG_TPL_ROCKCHIP_BACK_TO_BROM=y
 CONFIG_TARGET_ROCK=y
 CONFIG_SPL_STACK_R_ADDR=0x60080000
 CONFIG_DEFAULT_DEVICE_TREE="rk3188-radxarock"
@@ -49,5 +50,6 @@
 CONFIG_SYS_NS16550=y
 CONFIG_SYSRESET=y
 CONFIG_SPL_TINY_MEMSET=y
+CONFIG_TPL_TINY_MEMSET=y
 CONFIG_CMD_DHRYSTONE=y
 CONFIG_ERRNO_STR=y