power: supply: macsmc: Support macOS 27 SMC firmware

The SMC firmware included in macOS 27 changed the size of BCF0 key from
4 to 1 bytes. This key is used for indicating that battery state is
critically low. In addition, B0RM key has changed endianness.

Reviewed-by: Sven Peter <sven@kernel.org>
Reviewed-by: Joshua Peisach <jpeisach@ubuntu.com>
Reviewed-by: Janne Grunau <j@jannau.net>
Cc: stable@vger.kernel.org
Fixes: 0ebf821cf6c7 ("power: supply: Add macsmc-power driver for Apple Silicon")
Signed-off-by: Sasha Finkelstein <k@chaosmail.tech>
Link: https://patch.msgid.link/20260712-gate-power-v4-1-aa59c6583247@chaosmail.tech
Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.com>