efi: sysfb_efi: Fix lfb_linelength calculation when applying quirks

efi: sysfb_efi: Fix lfb_linelength calculation when applying quirks

PIXEL_BIT_MASK formats can have either less or more than four bytes per
pixel so lets fix the lfb_linelenght calculation when applying the
swapped width and height quirks.

Signed-off-by: Tvrtko Ursulin <tvrtko.ursulin@igalia.com>
Suggested-by: Thomas Zimmermann <tzimmermann@suse.de>
Cc: Thomas Zimmermann <tzimmermann@suse.de>
Cc: Ard Biesheuvel <ardb@kernel.org>
Cc: Melissa Wen <mwen@igalia.com>
Cc: linux-efi@vger.kernel.org
Tested-by: Melissa Wen <mwen@igalia.com> # v3
Reviewed-by: Thomas Zimmermann <tzimmermann@suse.de>
Signed-off-by: Ard Biesheuvel <ardb@kernel.org>