drivers: dma: silabs: change default max descriptor from 8 to 16

We need to add CONFIG_DMA_MAX_DESCRIPTOR=16 for a lot of tests, then
this default value of this parameter need to be higher. It allows to
delete some overlay files.

Signed-off-by: Martin Hoff <[email protected]>

Author: Martinhoff-maker

drivers/dma/Kconfig.silabs

@@ -14,7 +14,7 @@ if DMA_SILABS_LDMA
 
 config DMA_MAX_DESCRIPTOR
 	int "Max Number of block_config (LDMA_Descriptor)"
-	default 8
+	default 16
 	help
 	  Max Number of block_config (LDMA_Descriptor)