boards: m5stack: add support for M5Stack Fire

Adds support for the M5Stack Fire. Board files are adapted from those
used for the M5Stack Core2.

Aside from the 2 newest revisions the device also contains a BMM150
magnetometer which is not supported.

The LED strips on the sides are also not supported because Zephyr
does not support fast GPIO switching, see: #11917.

The IP5306 charger works by itself but doesn't have a driver written for
it thus it's not able to be interfaced with.

Signed-off-by: Jakub Novák <jakubnovak.cz@outlook.cz>