rockchip: rk3588: use DRAM banks from ATAGS

RK3588-based devices now support creating DRAM banks with proper holes
by reading the ATAGS from Rockchip TPL blob, so let's use that mechanism
instead.

The CONFIG_NR_DRAM_BANK now defaults to 10 which is a safe bet for
reading banks from ATAGS, so let's use the default value instead.

Co-developed-by: Chris Morgan <macromorgan@hotmail.com>
Signed-off-by: Chris Morgan <macromorgan@hotmail.com>
Signed-off-by: Quentin Schulz <quentin.schulz@theobroma-systems.com>
Reviewed-by: Kever Yang <kever.yang@rock-chips.com>
diff --git a/configs/jaguar-rk3588_defconfig b/configs/jaguar-rk3588_defconfig
index 3233b75..f29505e 100644
--- a/configs/jaguar-rk3588_defconfig
+++ b/configs/jaguar-rk3588_defconfig
@@ -3,7 +3,6 @@
 CONFIG_COUNTER_FREQUENCY=24000000
 CONFIG_ARCH_ROCKCHIP=y
 CONFIG_SPL_GPIO=y
-CONFIG_NR_DRAM_BANKS=2
 CONFIG_SF_DEFAULT_SPEED=24000000
 CONFIG_SF_DEFAULT_MODE=0x2000
 CONFIG_ENV_SIZE=0x1f000
diff --git a/configs/neu6a-io-rk3588_defconfig b/configs/neu6a-io-rk3588_defconfig
index 050f1e5..5619855 100644
--- a/configs/neu6a-io-rk3588_defconfig
+++ b/configs/neu6a-io-rk3588_defconfig
@@ -2,7 +2,6 @@
 CONFIG_SKIP_LOWLEVEL_INIT=y
 CONFIG_COUNTER_FREQUENCY=24000000
 CONFIG_ARCH_ROCKCHIP=y
-CONFIG_NR_DRAM_BANKS=2
 CONFIG_DEFAULT_DEVICE_TREE="rk3588-edgeble-neu6a-io"
 CONFIG_ROCKCHIP_RK3588=y
 CONFIG_SPL_SERIAL=y
diff --git a/configs/neu6b-io-rk3588_defconfig b/configs/neu6b-io-rk3588_defconfig
index dabb59a..40baec3 100644
--- a/configs/neu6b-io-rk3588_defconfig
+++ b/configs/neu6b-io-rk3588_defconfig
@@ -2,7 +2,6 @@
 CONFIG_SKIP_LOWLEVEL_INIT=y
 CONFIG_COUNTER_FREQUENCY=24000000
 CONFIG_ARCH_ROCKCHIP=y
-CONFIG_NR_DRAM_BANKS=2
 CONFIG_DEFAULT_DEVICE_TREE="rk3588-edgeble-neu6b-io"
 CONFIG_ROCKCHIP_RK3588=y
 CONFIG_SPL_SERIAL=y