spl: Ensure all SPL symbols in Kconfig have some SPL dependency

Tighten up symbol dependencies in a number of places.  Ensure that a SPL
specific option has at least a direct dependency on SPL.  In places
where it's clear that we depend on something more specific, use that
dependency instead.  This means in a very small number of places we can
drop redundant dependencies.

Reported-by: Pali Rohár <pali@kernel.org>
Signed-off-by: Tom Rini <trini@konsulko.com>
diff --git a/configs/at91sam9n12ek_nandflash_defconfig b/configs/at91sam9n12ek_nandflash_defconfig
index 18ec990..5ffa294 100644
--- a/configs/at91sam9n12ek_nandflash_defconfig
+++ b/configs/at91sam9n12ek_nandflash_defconfig
@@ -48,9 +48,7 @@
 CONFIG_GENERIC_ATMEL_MCI=y
 CONFIG_MTD=y
 CONFIG_NAND_ATMEL=y
-CONFIG_SPL_GENERATE_ATMEL_PMECC_HEADER=y
-CONFIG_SYS_NAND_PAGE_SIZE=0x800
-CONFIG_SYS_NAND_OOBSIZE=0x40
+CONFIG_ATMEL_NAND_HW_PMECC=y
 CONFIG_DM_SPI_FLASH=y
 CONFIG_SF_DEFAULT_SPEED=30000000
 CONFIG_SPI_FLASH_ATMEL=y