configs: j721e_sk: Move to separate defconfig for J721E SK board

Add defconfig for J721E SK R5 and A72 configuration.

This includes and modifies the J721E EVM defconfigs:
j721e_evm_r5_defconfig -> j721e_sk_r5_defconfig
j721e_evm_a72_defconfig -> j721e_sk_a72_defconfig

Signed-off-by: Neha Malcom Francis <n-francis@ti.com>
diff --git a/configs/j721e_evm_a72_defconfig b/configs/j721e_evm_a72_defconfig
index 3d8e939..b8d7c33 100644
--- a/configs/j721e_evm_a72_defconfig
+++ b/configs/j721e_evm_a72_defconfig
@@ -88,7 +88,7 @@
 # CONFIG_SPL_EFI_PARTITION is not set
 CONFIG_OF_CONTROL=y
 CONFIG_SPL_OF_CONTROL=y
-CONFIG_OF_LIST="k3-j721e-common-proc-board k3-j721e-sk"
+CONFIG_OF_LIST="k3-j721e-common-proc-board"
 CONFIG_MULTI_DTB_FIT=y
 CONFIG_SPL_MULTI_DTB_FIT=y
 CONFIG_SPL_MULTI_DTB_FIT_NO_COMPRESSION=y
diff --git a/configs/j721e_evm_r5_defconfig b/configs/j721e_evm_r5_defconfig
index cea48b2..37d582b 100644
--- a/configs/j721e_evm_r5_defconfig
+++ b/configs/j721e_evm_r5_defconfig
@@ -81,7 +81,7 @@
 CONFIG_OF_CONTROL=y
 CONFIG_SPL_OF_CONTROL=y
 CONFIG_SPL_MULTI_DTB_FIT=y
-CONFIG_SPL_OF_LIST="k3-j721e-r5-common-proc-board k3-j721e-r5-sk"
+CONFIG_SPL_OF_LIST="k3-j721e-r5-common-proc-board"
 CONFIG_SPL_MULTI_DTB_FIT_NO_COMPRESSION=y
 CONFIG_ENV_OVERWRITE=y
 CONFIG_SYS_RELOC_GD_ENV_ADDR=y
diff --git a/configs/j721e_sk_a72_defconfig b/configs/j721e_sk_a72_defconfig
new file mode 100644
index 0000000..8907b8a
--- /dev/null
+++ b/configs/j721e_sk_a72_defconfig
@@ -0,0 +1,9 @@
+#include <configs/j721e_evm_a72_defconfig>
+
+CONFIG_ARM=y
+CONFIG_ARCH_K3=y
+CONFIG_SOC_K3_J721E=y
+CONFIG_TARGET_J721E_A72_EVM=y
+
+CONFIG_DEFAULT_DEVICE_TREE="k3-j721e-sk"
+CONFIG_OF_LIST="k3-j721e-sk"
diff --git a/configs/j721e_sk_r5_defconfig b/configs/j721e_sk_r5_defconfig
new file mode 100644
index 0000000..b361c69
--- /dev/null
+++ b/configs/j721e_sk_r5_defconfig
@@ -0,0 +1,10 @@
+#include <configs/j721e_evm_r5_defconfig>
+
+CONFIG_ARM=y
+CONFIG_ARCH_K3=y
+CONFIG_SOC_K3_J721E=y
+CONFIG_TARGET_J721E_R5_EVM=y
+
+CONFIG_DEFAULT_DEVICE_TREE="k3-j721e-r5-sk"
+CONFIG_SPL_OF_LIST="k3-j721e-r5-sk"
+CONFIG_OF_LIST="k3-j721e-r5-sk"