serial: Rename SERIAL_SUPPORT to SERIAL

Rename these options so that CONFIG_IS_ENABLED can be used with them.

Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/arch/arm/mach-omap2/Kconfig b/arch/arm/mach-omap2/Kconfig
index 2c08a9a..2631426 100644
--- a/arch/arm/mach-omap2/Kconfig
+++ b/arch/arm/mach-omap2/Kconfig
@@ -24,7 +24,7 @@
 	imply SPL_NAND_SUPPORT
 	imply SPL_OMAP3_ID_NAND
 	imply SPL_POWER
-	imply SPL_SERIAL_SUPPORT
+	imply SPL_SERIAL
 	imply SYS_I2C_OMAP24XX
 	imply SYS_THUMB_BUILD
 	imply TWL4030_POWER
@@ -46,7 +46,7 @@
 	imply SPL_NAND_SIMPLE
 	imply SPL_NAND_SUPPORT
 	imply SPL_POWER
-	imply SPL_SERIAL_SUPPORT
+	imply SPL_SERIAL
 	imply SYS_I2C_OMAP24XX
 	imply SYS_THUMB_BUILD
 
@@ -71,7 +71,7 @@
 	imply SPL_NAND_AM33XX_BCH
 	imply SPL_NAND_SUPPORT
 	imply SPL_POWER
-	imply SPL_SERIAL_SUPPORT
+	imply SPL_SERIAL
 	imply SYS_I2C_OMAP24XX
 
 config TI814X