conf: machine: add AM69-SK machine configuration

As of commits [1] and [2] in ti-u-boot-2024.04 and upstream respectively
there is a separate defconfig to build u-boot for j784s4-evm and am69-sk

Hence, introduce new yocto machine configs for am69-sk. Also remove am69
devicetree builds from the j784s4-evm conf

[1]: https://git.ti.com/cgit/ti-u-boot/ti-u-boot/commit/?h=ti-u-boot-2024.04&id=8a46af7a39e6218e4de5c6195697af36201c778c
[2]: https://source.denx.de/u-boot/u-boot/-/commit/740759d558e632e1540d620baadbcc46fdf24db2

Signed-off-by: Beleswar Padhi <b-padhi@ti.com>
Signed-off-by: Aniket Limaye <a-limaye@ti.com>
Signed-off-by: Ryan Eatmon <reatmon@ti.com>

meta-ti-bsp/conf/machine/am69-sk-k3r5.conf

@@ -0,0 +1,11 @@
+#@TYPE: Machine
+#@NAME: AM69 SK (R5F)
+#@DESCRIPTION: Machine configuration for the TI AM69 SK (R5F core)
+
+require conf/machine/include/k3r5.inc
+
+SYSFW_SOC = "j784s4"
+SYSFW_CONFIG = "evm"
+SYSFW_SUFFIX = "hs-fs"
+
+UBOOT_MACHINE = "am69_sk_r5_defconfig"

meta-ti-bsp/conf/machine/am69-sk.conf

@@ -0,0 +1,20 @@
+#@TYPE: Machine
+#@NAME: AM69 SK
+#@DESCRIPTION: Machine configuration for the TI AM69 SK
+
+require conf/machine/include/j784s4.inc
+
+TFA_K3_USART = "0x8"
+OPTEE_K3_USART = "0x8"
+
+KERNEL_DEVICETREE_PREFIX = " \
+    ti/k3-am69-sk \
+    ti/k3-fpdlink \
+    ti/k3-v3link \
+"
+
+KERNEL_DEVICETREE = " \
+    ti/k3-am69-sk.dtb \
+"
+
+UBOOT_MACHINE = "am69_sk_a72_defconfig"

meta-ti-bsp/conf/machine/j784s4-evm.conf

@@ -11,7 +11,6 @@ KERNEL_DEVICETREE_PREFIX = " \
     ti/k3-j784s4 \
     ti/k3-fpdlink \
     ti/k3-j7200-evm-mcspi-loopback \
-    ti/k3-am69-sk \
     ti/k3-v3link \
 "