most: tell what the MOST acronym means

Tell kconfig users what "MOST" means so that they can have a bit
of information about what it is. I.e., more than zero information.

Signed-off-by: Randy Dunlap <[e-mail]>
Cc: Christian Gromm <[e-mail]>
Cc: Greg Kroah-Hartman <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Greg Kroah-Hartman <[e-mail]>

drivers/most/Kconfig

···
 # SPDX-License-Identifier: GPL-2.0
 menuconfig MOST
-	tristate "MOST support"
+	tristate "MOST (Media Oriented Systems Transport) support"
 	depends on HAS_DMA && CONFIGFS_FS
 	default n
 	help