ASoC: twl4030: make read-only array ramp_base static const

Don't populate the read-only array ramp_base on the stack but
instead make it static const. Also makes the object code a
little smaller.

Signed-off-by: Colin Ian King <colin.i.king@gmail.com>
Link: https://lore.kernel.org/r/20221018152928.942186-1-colin.i.king@gmail.com


Signed-off-by: Mark Brown <broonie@kernel.org>