libsa: Remove redundant sys/cdefs.h

Sponsored by: Netflix

Remove $FreeBSD$: one-line .c pattern

Remove /^[\s*]*__FBSDID\("\$FreeBSD\$"\);?\s*\n/

loader.efi: fix panic() after BS off

panic() is using multiple services - attempting to read
keyboard, accessing time functions and finally, exiting the loader.

Protect all the accessed listed above. Note, when BS are off,
we really can not just exit the loader, we only can reboot.

MFC after: 1 week

efi loader: Call tslog_init from efi_main

We were calling tslog_init from main; no reason to wait that long.

Fixes: f49381ccb6bc efi/loader: Call tslog_init
Sponsored by: https://www.patreon.com/cperciva

loader.efi: replace HandleProtocol() with OpenProtocol()

The HandleProtocol() is deprecated interface and we should use OpenProtocol()
instead. Moreover, in some firmware implementation(s), the HandleProtocol()
does return device path using static storage, so we can not keep the value
returned there. With same firmware, the OpenProtocol() does return data we
do not need to clone.

Reviewed by: imp
Differential Revision: https://reviews.freebsd.org/D21162

Cast error message in efi_main.c to CHAR16* to avoid build error

Print an error message in efi_main.c if we can't allocate memory for the heap

With the default Qemu parameters, only 128MB RAM gets given to a VM. This causes
the loader to be unable to allocate the 64MB it needs for the heap. This change
makes the cause of the error more obvious.

Differential Revision: https://reviews.freebsd.org/D17958

Move sys/boot to stand. Fix all references to new location

Sponsored by: Netflix