dmaengine: mmp_tdma: Remove the MMP_SRAM dependency

A generic SRAM will driver for Device Tree enabled platforms will do as
well.

The non-DT drivers that use mmp_tdma to transfer audio samples to and from
the audio SRAM should depend on MMP_SRAM themselves.
Signed-off-by: Lubomir Rintel <lkundrak@v3.sk>
Link: https://lore.kernel.org/r/20200419164912.670973-8-lkundrak@v3.skSigned-off-by: Vinod Koul <vkoul@kernel.org>

drivers/dma/Kconfig

@@ -394,12 +394,10 @@ config MMP_TDMA
 	bool "MMP Two-Channel DMA support"
 	depends on ARCH_MMP || COMPILE_TEST
 	select DMA_ENGINE
-	select MMP_SRAM if ARCH_MMP
 	select GENERIC_ALLOCATOR
 	help
 	  Support the MMP Two-Channel DMA engine.
 	  This engine used for MMP Audio DMA and pxa910 SQU.
-	  It needs sram driver under mach-mmp.
 
 config MOXART_DMA
 	tristate "MOXART DMA support"