image_types_qcom: remove QCOM_ROOTFS_FILE, standardize on rootfs.img

The qcom-ptool partition definitions expect the root filesystem image to be
named rootfs.img by default, so there is no need to support a custom name via
QCOM_ROOTFS_FILE.

This aligns with other similar image files which are using a known and hardcoded
file name.

Signed-off-by: Ricardo Salveti <[email protected]>

Author: ricardosalveti

classes-recipe/image_types_qcom.bbclass

@@ -22,7 +22,6 @@ QCOM_PARTITION_FILES_SUBDIR ??= "${QCOM_BOOT_FILES_SUBDIR}"
 
 QCOM_PARTITION_CONF ?= "qcom-partition-conf"
 
-QCOM_ROOTFS_FILE ?= "rootfs.img"
 IMAGE_QCOMFLASH_FS_TYPE ??= "ext4"
 
 QCOMFLASH_DIR = "${IMGDEPLOYDIR}/${IMAGE_NAME}.qcomflash"
@@ -73,7 +72,7 @@ create_qcomflash_pkg() {
         install -m 0644 "${DEPLOY_DIR_IMAGE}/boot-${MACHINE}.img" boot.img
 
     # rootfs image
-    install -m 0644 ${IMGDEPLOYDIR}/${IMAGE_LINK_NAME}.${IMAGE_QCOMFLASH_FS_TYPE} ${QCOM_ROOTFS_FILE}
+    install -m 0644 ${IMGDEPLOYDIR}/${IMAGE_LINK_NAME}.${IMAGE_QCOMFLASH_FS_TYPE} rootfs.img
 
     # partition bins
     for pbin in `find ${DEPLOY_DIR_IMAGE}/${QCOM_PARTITION_FILES_SUBDIR} -maxdepth 1 -type f -name 'gpt_main*.bin' \