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/ax25-ae350_defconfig b/configs/ax25-ae350_defconfig
index 5cc5e07..a853c99 100644
--- a/configs/ax25-ae350_defconfig
+++ b/configs/ax25-ae350_defconfig
@@ -4,6 +4,7 @@
 CONFIG_TARGET_AX25_AE350=y
 CONFIG_CPU_RISCV_64=y
 CONFIG_DISTRO_DEFAULTS=y
+CONFIG_NR_DRAM_BANKS=2
 CONFIG_FIT=y
 CONFIG_BOOTDELAY=3
 CONFIG_BOARD_EARLY_INIT_F=y