[Bug 212648] [EFI] Increase size of boot1.efifat

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=212648

            Bug ID: 212648
           Summary: [EFI] Increase size of boot1.efifat
           Product: Base System
           Version: CURRENT
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: misc
          Assignee: freebsd-bugs at FreeBSD.org
          Reporter: ganael.laplanche at corp.ovh.com

Created attachment 174717
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=174717&action=edit
Patch to increase boot1.efifat size

This patch is a follow-up to PR 212604.

Now that ESP size has been enlarged to 200m, find attached a patch the enables
the creation of a 200m boot1.efifat image.

- EFI partition is now FAT32 (as found on Linux distributions) and uses 4
sectors per cluster (arbitrary value to overcome the "too few clusters for
FAT32" error reported by newfs_msdos)
- zfsboot script now uses dd to write partition data as gpart bootcode has a
(arbitrary) hardcoded limit of 1MB files
- Do not forget to regenerate sys/boot/efi/boot1/fat*.tmpl.bz2.uu and
sys/boot/efi/boot1/Makefile.fat files using sys/boot/efi/boot1/generate-fat.sh
!
- Successfully tested on a Supermicro X9SRI-F motherboard (patch *NOT* tested
on other platforms: arm, arm64, i386)
- We will probably have to remove boot1.efifat from media where it is useless
and stored uncompressed (e.g. CD ISOs) as adding 200 MB is unacceptable there

Note: this patch includes ESP size increase patch from:
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=212604

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