simplicity_sdk: Patch dmadrv to support cross channel allocator

Patch needed to remain synchronize between zephyr DMA channels allocator
and dmadrv channel allocator.

Signed-off-by: Martin Hoff <martin.hoff@silabs.com>

simplicity_sdk/platform/emdrv/dmadrv/inc/dmadrv.h

@@ -102,6 +102,8 @@ typedef bool (*DMADRV_Callback_t)(unsigned int channel,
 
 Ecode_t DMADRV_AllocateChannel(unsigned int *channelId,
                                void         *capabilities);
+Ecode_t DMADRV_AllocateChannelById(unsigned int channelId, 
+                                   void         *capabilities);
 Ecode_t DMADRV_DeInit(void);
 Ecode_t DMADRV_FreeChannel(unsigned int channelId);
 Ecode_t DMADRV_Init(void);

simplicity_sdk/platform/emdrv/dmadrv/src/dmadrv.c

@@ -165,6 +165,44 @@ Ecode_t DMADRV_AllocateChannel(unsigned int *channelId, void *capabilities)
   return ECODE_EMDRV_DMADRV_CHANNELS_EXHAUSTED;
 }
 
+/***************************************************************************//**
+ * @brief
+ *  Allocate (reserve) the given DMA channel if he is free.
+ *
+ * @param[out] channelId
+ *  The channel ID to be assigned by DMADRV.
+ *
+ * @param[in] capabilities
+ *  Not used.
+ *
+ * @return
+ *  @ref ECODE_EMDRV_DMADRV_OK on success. On failure, an appropriate
+ *  DMADRV @ref Ecode_t is returned.
+ ******************************************************************************/
+Ecode_t DMADRV_AllocateChannelById(unsigned int channelId, void *capabilities)
+{
+  (void)capabilities;
+  CORE_DECLARE_IRQ_STATE;
+
+  if ( !initialized ) {
+    return ECODE_EMDRV_DMADRV_NOT_INITIALIZED;
+  }
+
+  if ( channelId >= EMDRV_DMADRV_DMA_CH_COUNT ) {
+    return ECODE_EMDRV_DMADRV_PARAM_ERROR;
+  }
+
+  CORE_ENTER_ATOMIC();
+  if ( !chTable[channelId].allocated ) {
+    chTable[channelId].allocated = true;
+    chTable[channelId].callback  = NULL;
+    CORE_EXIT_ATOMIC();
+    return ECODE_EMDRV_DMADRV_OK;
+  }
+  CORE_EXIT_ATOMIC();
+  return ECODE_EMDRV_DMADRV_IN_USE;
+}
+
 /***************************************************************************//**
  * @brief
  *  Deinitialize DMADRV.