Revert "arm: Drop linker script when building without PIE"

This reverts commit f64abb828860319c3478d637014b36ecb531d3ee.
Revert "Fix for build break when PRODUCT_BOOTANIMATION is unset"

This reverts commit e8fa6841c07ab718e1f406015a24c73522add949.
Revert "Restore original behavior when PRODUCT_BOOTANIMATION is undefined"

This reverts commit 3d456d010c3d3657938d2590078b28e609223394.
Revert "Add PRODUCT_BOOTANIMATION"

This reverts commit 79ce81d570497b816134c523bbe03bf802eb8ebf.
Revert "add cortex-a5 cpu variant"

This reverts commit 86bcc98b63103a324daa611527211ba110751070.