ath10k: remove experimental tag from SDIO and SNOC busses in Kconfig

ath10k(sdio/snoc) is no longer experimental. Remove experimental tag for
SDIO/SNOC from ath10k Kconfig.

Signed-off-by: Govind Singh <govinds@codeaurora.org>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>
Link: https://lore.kernel.org/r/20200507055324.15564-1-govinds@codeaurora.org