fastboot: Correct dependencies in FASTBOOT_FLASH

Ensure that when selecting FASTBOOT_FLASH you end up with a buildable
configuration. Prior to this you could select NAND without MTDPARTS
and end up with an image which (surprisingly) excluded NAND.

Also fix dependencies on FASTBOOT_GPT_NAME/FASTBOOT_MBR_NAME which require
you have EFI_PARTITION/DOS_PARTITION enabled.

Delete redundant FASTBOOT_FLASH_NAND_DEV from Kconfig - it was only ever
used as a guard and the value was ignored in all cases, we're using
FASTBOOT_FLASH_NAND as the guard now.

Signed-off-by: Alex Kiernan <alex.kiernan@gmail.com>
Reviewed-by: Joe Hershberger <joe.hershberger@ni.com>
diff --git a/arch/arm/mach-omap2/utils.c b/arch/arm/mach-omap2/utils.c
index dc7b37f..edf5edc 100644
--- a/arch/arm/mach-omap2/utils.c
+++ b/arch/arm/mach-omap2/utils.c
@@ -85,7 +85,7 @@
 	env_set("fastboot.board_rev", board_rev);
 }
 
-#ifdef CONFIG_FASTBOOT_FLASH_MMC_DEV
+#ifdef CONFIG_FASTBOOT_FLASH_MMC
 static u32 omap_mmc_get_part_size(const char *part)
 {
 	int res;
@@ -128,7 +128,7 @@
 static inline void omap_set_fastboot_userdata_size(void)
 {
 }
-#endif /* CONFIG_FASTBOOT_FLASH_MMC_DEV */
+#endif /* CONFIG_FASTBOOT_FLASH_MMC */
 void omap_set_fastboot_vars(void)
 {
 	omap_set_fastboot_cpu();