serial: msm-geni: Update kconfig name for DEBUG_UART_MSM_GENI

serial: msm-geni: Update kconfig name for DEBUG_UART_MSM_GENI

The previous description "Qualcomm snapdragon" barely tells the user
anything, update the name so that it's clear which configs the user can
choose between, namely the older QUP driver, or the newer GENI driver.

Signed-off-by: Luca Weiss <luca.weiss@fairphone.com>
Reviewed-by: Neil Armstrong <neil.armstrong@linaro.org>
Link: https://lore.kernel.org/r/20250924-2025-10-misc-v1-3-7e75842ca714@fairphone.com
Signed-off-by: Casey Connolly <kcxt@postmarketos.org>