MAINTAINERS: Add Vignesh as maintainer of TI SDHCI OMAP DRIVER

Add Vignesh Raghavendra as maintainer of TI SDHCI OMAP DRIVER.

Cc: Vignesh Raghavendra <vigneshr@ti.com>
Signed-off-by: Kishon Vijay Abraham I <kishon@ti.com>
Link: https://lore.kernel.org/r/20220923065005.20062-1-kishon@ti.com


Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>