initramfs-firmware-sm8750-mtp-image: add SM8750 MTP initramfs firmware image

Introduce initramfs firmware image recipe for SM8750 MTP board based on
common initramfs-firmware-image.inc. This image includes required firmware
files via `packagegroup-sm8750-mtp-firmware`.

Signed-off-by: Vivek Puar <vpuar@qti.qualcomm.com>

Author: vivpuar

recipes-bsp/images/initramfs-firmware-sm8750-mtp-image.bb

@@ -0,0 +1,7 @@
+DESCRIPTION = "Tiny ramdisk image with SM8750 MTP firmware files"
+
+PACKAGE_INSTALL += " \
+    packagegroup-sm8750-mtp-firmware \
+"
+
+require initramfs-firmware-image.inc