Revert "target: samarium: Add support for new platform subtype"
Revert "target: samarium: Add support for new platform subtype"

Remove support for unwanted samarium platform.

This reverts commit 20e0dd150e28e16d88ba9a598399e692f5dc3999.

Change-Id: Ib431d6b6cb40320e79e58641c6c17e2b9aa12d0a

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