SOFT: Increase test capture pipeline max. channels count to 4

The 4ch DMIC capture test topologies can't work without this change to
pipeline.

Signed-off-by: Seppo Ingalsuo <seppo.ingalsuo@linux.intel.com>

Author: singalsu

topology/test/test-capture.m4

@@ -39,11 +39,11 @@ include(`byt.m4')
 # PCM0 <---> SSP TEST_DAI_PORT
 #
 
-# Passthrough playback pipeline 2 on PCM 0 using max 2 channels of s24le.
+# Passthrough capture pipeline 2 on PCM 0 using max 4 channels.
 # Schedule 48 frames per 1000us deadline on core 0 with priority 0
 
 PIPELINE_PCM_DAI_ADD(sof/pipe-TEST_PIPE_NAME-capture.m4,
-	2, 0, 2, TEST_PIPE_FORMAT,
+	2, 0, 4, TEST_PIPE_FORMAT,
 	48, 1000, 0, 0,
 	TEST_DAI_TYPE, TEST_DAI_PORT, TEST_DAI_FORMAT, 2)