efi: fix alignment for block device protocol

efi_block_io_media struct needs padding on x86.
uint64_t is aligned on 4 bytes in Haiku toolchain for 32-bit EFI loader.
But the EFI firmware expects it to be aligned on 8 bytes.

Same padding in u-boot:
https://github.com/u-boot/u-boot/blob/v2021.10/include/efi_api.h#L638

and in Illumos:
https://github.com/illumos/illumos-gate/commit/feff18a41e45afb02478e67d56fad5027334f115

Change-Id: I1b95cbe4cc1e7d96fde3ba52862a05f8a94aab79
Reviewed-on: https://review.haiku-os.org/c/haiku/+/4840
Reviewed-by: Fredrik Holmqvist <fredrik.holmqvist@gmail.com>

Efi: fix headers for 32 bit platforms

Change-Id: Id43bfcbfc24b1adb8f6e9fff587c6df9b62910f2
Reviewed-on: https://review.haiku-os.org/c/haiku/+/2413
Reviewed-by: Alex von Gluck IV <kallisti5@unixzen.com>
Reviewed-by: waddlesplash <waddlesplash@gmail.com>

efi: Refactor our EFI code to use fuchsia's cleaner EFI headers.

* Drop gnu-efi

Change-Id: Ib601fc8ced49b18281b6b98cf861a5aef1b9c065
Reviewed-on: https://review.haiku-os.org/c/haiku/+/2026
Reviewed-by: Alex von Gluck IV <kallisti5@unixzen.com>
Reviewed-by: Adrien Destugues <pulkomandy@gmail.com>