app: aboot: Remove ifdef for SDHCI support in cmd_erase
app: aboot: Remove ifdef for SDHCI support in cmd_erase

In some UFS vendor parts unmap command doesn't zero out the unmapped
blocks. Hence the data is still preserved after a reboot. This change
removes the dependency for ufs and emmc definitions for cmd_erase to
co-exist in the same build.

Change-Id: Ifb4a425f4269b177b849ac4fe7d75de81490bf05

efidroid/lk,Foxda-Tech/polaris-bootable-bootloader-lk,Foxda-Tech/polaris-bootable-bootloader-lk,efidroid/lk,efidroid/lk,Foxda-Tech/polaris-bootable-bootloader-lk,efidroid/lk,efidroid/lk,Foxda-Tech/polaris-bootable-bootloader-lk,Foxda-Tech/polaris-bootable-bootloader-lk