ti: remove usage of DM_I2C_COMPAT and don't disable DM_I2C in SPL

DM_I2C_COMPAT is a compatibility layer that allows using the non-DM I2C
API when DM_I2C is used. The goal is to eventually remove DM_I2C_COMPAT
when all I2C "clients" have been migrated to use the DM API.
This a step in that direction for the TI based platforms.
Build tested with buildman:
buildman -dle am33xx ti omap3 omap4 omap5 davinci keystone

boot tested with:
am335x_evm, am335x_boneblack, am335x_boneblack_vboot (DM version),
am57xx_evm, dra7xx_evm, k2g_evm, am437x_evm

Signed-off-by: Jean-Jacques Hiblot <jjhiblot@ti.com>
Reviewed-by: Tom Rini <trini@konsulko.com>
Reviewed-by: Heiko Schocher <hs@denx.de>
diff --git a/include/configs/ti_armv7_common.h b/include/configs/ti_armv7_common.h
index 0f892e5..1e2a62d 100644
--- a/include/configs/ti_armv7_common.h
+++ b/include/configs/ti_armv7_common.h
@@ -74,24 +74,10 @@
 /* Timer information. */
 #define CONFIG_SYS_PTV			2	/* Divisor: 2^(PTV+1) => 8 */
 
-/*
- * Disable DM_* for SPL build and can be re-enabled after adding
- * DM support in SPL
- */
-#ifdef CONFIG_SPL_BUILD
-#undef CONFIG_DM_I2C
-#endif
-
-/* I2C IP block */
+/* If DM_I2C, enable non-DM I2C support */
+#if !defined(CONFIG_DM_I2C)
 #define CONFIG_I2C
-#ifndef CONFIG_DM_I2C
 #define CONFIG_SYS_I2C
-#else
-/*
- * Enable CONFIG_DM_I2C_COMPAT temporarily until all the i2c client
- * devices are adopted to DM
- */
-#define CONFIG_DM_I2C_COMPAT
 #endif
 
 /*