loader.efi: There are systems without ConOut, also use ConOutDev

Conout does contian the default output device name.
ConOutDev does contain all possible output device names, so we can
use it as fall

loader.efi: There are systems without ConOut, also use ConOutDev

Conout does contian the default output device name.
ConOutDev does contain all possible output device names, so we can
use it as fallback, when there is no ConOut.

PR: 253253

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loader: create built in font from bold font face

We did replace full version of default font 8x16v with bold, also
use bold version for built in font.

loader: Use TERM_EMU for arm and arm64

Even if it didn't behave well previously this is fixed.
Tested on: OrangePi One (armv7 u-boot) (serial only and serial + HDMI)
Tested on: Pine64-LTS (aarch64 u

loader: Use TERM_EMU for arm and arm64

Even if it didn't behave well previously this is fixed.
Tested on: OrangePi One (armv7 u-boot) (serial only and serial + HDMI)
Tested on: Pine64-LTS (aarch64 u-boot) (serial only and serial + HDMI)
Tested on: Honeycomb (aarch64 EDK2) (serial only)

Reviewed by: imp
Differential Revision: https://reviews.freebsd.org/D28153

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loader.efi: commands gop, uga and autoresize should use cached data

We are setting up pointers for gop or uga protocol in
efi_find_framebuffer(), reuse those pointers.

loader.efi: variable 'hlist' is uninitialized

framebuffer.c:481:65: error: variable 'hlist' is uninitialized

loader.efi: unused variable 'mode'

framebuffer.c:707:8: error: unused variable 'mode' [-Wunused-variable]
u_int mode;

loader.efi: handle multiple gop instances

Some systems may provide multiple GOP instances and not all are
bound to hardware. The current loader is picking up the first GOP,
which may not be usable.

loader.efi: handle multiple gop instances

Some systems may provide multiple GOP instances and not all are
bound to hardware. The current loader is picking up the first GOP,
which may not be usable. Instead we load the GOP handle array,
and test every handle to have registered ConOut protocol. If ConOut is
present, we can use this GOP handle to open GOP protocol.

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