conf: machine: am62: Add FIT_CONF_DEFAULT_DTB

FIT_CONF_DEFAULT_DTB config specifies the default dtb file for the FIT
image when multiple ones are provided[1].

Since the variable is not set in current machine configs, the default is
set to the first dtb read during FIT image creation which doesn't give
us direct control over the default configuration.

Therefore this patch adds default dtbs for am62 evms.

[1]:
https://docs.yoctoproject.org/ref-manual/variables.html#term-FIT_CONF_DEFAULT_DTB

Signed-off-by: Anshul Dalal <anshuld@ti.com>
Signed-off-by: Ryan Eatmon <reatmon@ti.com>

meta-ti-bsp/conf/machine/am62axx-evm.conf

@@ -20,4 +20,6 @@ KERNEL_DEVICETREE = " \
     ti/k3-am62x-sk-hdmi-audio.dtbo \
 "
 
+FIT_CONF_DEFAULT_DTB = "ti/k3-am62a7-sk.dtb"
+
 UBOOT_MACHINE = "am62ax_evm_a53_defconfig"

meta-ti-bsp/conf/machine/am62pxx-evm.conf

@@ -21,6 +21,8 @@ KERNEL_DEVICETREE = " \
     ti/k3-am62x-sk-hdmi-audio.dtbo \
 "
 
+FIT_CONF_DEFAULT_DTB = "ti/k3-am62p5-sk.dtb"
+
 UBOOT_MACHINE = "am62px_evm_a53_defconfig"
 
 # UBOOT_CONFIG_FRAGMENTS holds the list of u-boot config fragments which has to be build

meta-ti-bsp/conf/machine/am62xx-evm.conf

@@ -31,4 +31,6 @@ KERNEL_DEVICETREE = " \
     ti/k3-am62x-sk-hdmi-audio.dtbo \
 "
 
+FIT_CONF_DEFAULT_DTB = "ti/k3-am625-sk.dtb"
+
 UBOOT_MACHINE = "am62x_evm_a53_defconfig"

meta-ti-bsp/conf/machine/am62xx-lp-evm.conf

@@ -22,4 +22,6 @@ KERNEL_DEVICETREE = " \
     ti/k3-am62x-sk-hdmi-audio.dtbo \
 "
 
+FIT_CONF_DEFAULT_DTB = "ti/k3-am62-lp-sk.dtb"
+
 UBOOT_MACHINE = "am62x_lpsk_a53_defconfig"

meta-ti-bsp/conf/machine/am62xxsip-evm.conf

@@ -13,6 +13,8 @@ KERNEL_DEVICETREE = " \
     ti/k3-am625-sk.dtb \
 "
 
+FIT_CONF_DEFAULT_DTB = "ti/k3-am625-sk.dtb"
+
 UBOOT_MACHINE = "am62xsip_evm_a53_defconfig"
 
 UBOOT_MACHINE:bsp-ti-6_1 = "am62x_evm_a53_defconfig"