ANDROID: Split ANDROID_STRUCT_PADDING into separate configs

Not all non-GKI platforms support disabling ANDROID_STRUCT_PADDING,
as some modules may require Android vendor data. However, it would be
beneficial to have the option to disable some of the struct paddings,
such as ANDROID_KABI_RESERVE, for memory savings given a situation
where the ANDROID_STRUCT_PADDING config cannot be disabled.

Split the ANDROID_STRUCT_PADDING config into two configs, one to control
ANDROID_VENDOR_DATA and ANDROID_OEM_DATA, and another to control
ANDROID_KABI_RESERVE.

Bug: 206561931
Change-Id: Iea4b962dff386a17c9bef20ae048be4e17bf43ab
Signed-off-by: Jaskaran Singh <quic_jasksing@quicinc.com>