configs: Migrate CONFIG_NR_DRAM_BANKS

We have the following cases:
- CONFIG_NR_DRAM_BANKS was defined, migrate normally
- CONFIG_NR_DRAM_BANKS_MAX was defined and then used for
  CONFIG_NR_DRAM_BANKS after a check, just migrate it over now.
- CONFIG_NR_DRAM_BANKS was very oddly defined on p2771-0000-* (to 1024 +
  2), set this to 8.

Signed-off-by: Tom Rini <trini@konsulko.com>
diff --git a/configs/edb9315a_defconfig b/configs/edb9315a_defconfig
index b0e2622..b34f5c9 100644
--- a/configs/edb9315a_defconfig
+++ b/configs/edb9315a_defconfig
@@ -1,6 +1,7 @@
 CONFIG_ARM=y
 CONFIG_TARGET_EDB93XX=y
 CONFIG_SYS_TEXT_BASE=0x60000000
+CONFIG_NR_DRAM_BANKS=8
 CONFIG_SYS_EXTRA_OPTIONS="MK_edb9315a"
 CONFIG_USE_BOOTARGS=y
 CONFIG_BOOTARGS="root=/dev/nfs console=ttyAM0,115200 ip=dhcp"