am335x_evm: Switch to using imply keyword

These particular SPL options are part of what the ROM provides, but for
compatibility with how we have previously used them, move them to being
implied by the board being selected.

Signed-off-by: Tom Rini <trini@konsulko.com>

arch/arm/mach-omap2/am33xx/Kconfig

@@ -15,6 +15,9 @@ config TARGET_AM335X_EVM
 	select DM_SERIAL
 	select DM_GPIO
 	select TI_I2C_BOARD_DETECT
+	imply SPL_YMODEM_SUPPORT
+	imply SPL_ENV_SUPPORT
+	imply SPL_WATCHDOG_SUPPORT
 	help
 	  This option specifies support for the AM335x
 	  GP and HS EVM development platforms. The AM335x

board/ti/am335x/Kconfig

 if TARGET_AM335X_EVM
 
-config SPL_ENV_SUPPORT
-	default y
-
-config SPL_WATCHDOG_SUPPORT
-	default y
-
-config SPL_YMODEM_SUPPORT
-	default y
-
 config SYS_BOARD
 	default "am335x"