OMAP3: add missing gpio clock init and fix NAND SPL for mcx board

Patch contains the same fixes as commit
4b9b2c30
(missing CONFIG_OMAP3_GPIO_2) and commit
f9095aac793aa8917ab9b915c5d449e6dc8d3d30 (missing CONFIG_SPL_NAND_SOFTECC).
Same issues are relevant for the mcx board, too.

Signed-off-by: Stefano Babic <sbabic@denx.de>

include/configs/mcx.h

@@ -98,6 +98,7 @@
 
 /* EHCI */
 #define CONFIG_USB_STORAGE
+#define CONFIG_OMAP3_GPIO_2
 #define CONFIG_OMAP3_GPIO_5
 #define CONFIG_USB_EHCI
 #define CONFIG_USB_EHCI_OMAP
@@ -395,6 +396,7 @@
 #define CONFIG_SYS_NAND_ECCSIZE		256
 #define CONFIG_SYS_NAND_ECCBYTES	3
 #define CONFIG_NAND_OMAP_ECCSCHEME	OMAP_ECC_HAM1_CODE_SW
+#define CONFIG_SPL_NAND_SOFTECC
 
 #define CONFIG_SYS_NAND_U_BOOT_START   CONFIG_SYS_TEXT_BASE