app: aboot: Add support for flashing modem via fastboot
app: aboot: Add support for flashing modem via fastboot

Change-Id: I75c116f716e0ef4029c53f805c90d117d5a782ba

efidroid/lk,CanarySolutions/little-kernel,M1cha/android_bootable_bootloader_lk,M1cha/android_bootable_bootloader_lk,M1cha/android_bootable_bootloader_lk,Foxda-Tech/polaris-bootable-bootloader-lk,M1cha/android_bootable_bootloader_lk,M1cha/lktris,Foxda-Tech/argo8-bootable-bootloader-lk,jsr-d10/android_bootable_bootloader_lk,Foxda-Tech/argo8-bootable-bootloader-lk,M1cha/lktris,jsr-d10/android_bootable_bootloader_lk,detule/lk-g2-spr,M1cha/lktris,Foxda-Tech/polaris-bootable-bootloader-lk,CanarySolutions/little-kernel,detule/lk-g2-spr,efidroid/lk,jsr-d10/android_bootable_bootloader_lk,Foxda-Tech/argo8-bootable-bootloader-lk,Foxda-Tech/polaris-bootable-bootloader-lk,detule/lk-g2-spr,M1cha/android_bootable_bootloader_lk,CanarySolutions/little-kernel,CanarySolutions/little-kernel,jsr-d10/android_bootable_bootloader_lk,Foxda-Tech/polaris-bootable-bootloader-lk,detule/lk-g2-spr,CanarySolutions/little-kernel,Foxda-Tech/polaris-bootable-bootloader-lk,M1cha/android_bootable_bootloader_lk,efidroid/lk,detule/lk-g2-spr,M1cha/lktris,jsr-d10/android_bootable_bootloader_lk,Foxda-Tech/argo8-bootable-bootloader-lk,efidroid/lk,Foxda-Tech/argo8-bootable-bootloader-lk,M1cha/lktris,efidroid/lk