ASoC: dt-bindings: q6asm: Add Q6ASM_DAI_{TX_RX, TX, RX} defines

Right now the direction of a DAI has to be specified as a literal
number in the device tree, e.g.:

dai@0 {
reg = <0>;
direction = <2>;
};

but this does not make it immediately clear that this is a
playback/RX-only DAI.

Actually, q6asm-dai.c has useful defines for this. Move them to the
dt-bindings header to allow using them in the dts(i) files.
The example above then becomes:

dai@0 {
reg = <0>;
direction = <Q6ASM_DAI_RX>;
};

which is immediately recognizable as playback/RX-only DAI.

Signed-off-by: Stephan Gerhold <[e-mail]>
Reviewed-by: Srinivas Kandagatla <[e-mail]>
Cc: Srinivas Kandagatla <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Mark Brown <[e-mail]>

Documentation/devicetree/bindings/sound/qcom,q6asm.txt

···
 	Usage: Required for Compress offload dais
 	Value type: <u32>
 	Definition: Specifies the direction of the dai stream
-			0 for both tx and rx
-			1 for only tx (Capture/Encode)
-			2 for only rx (Playback/Decode)
+			Q6ASM_DAI_TX_RX (0) for both tx and rx
+			Q6ASM_DAI_TX (1) for only tx (Capture/Encode)
+			Q6ASM_DAI_RX (2) for only rx (Playback/Decode)
 
 - is-compress-dai:
 	Usage: Required for Compress offload dais
···
 
 
 = EXAMPLE
+#include <dt-bindings/sound/qcom,q6asm.h>
 
 apr-service@7 {
 	compatible = "qcom,q6asm";
···
 
 		dai@0 {
 			reg = <0>;
-			direction = <2>;
+			direction = <Q6ASM_DAI_RX>;
 			is-compress-dai;
 		};
 	};

include/dt-bindings/sound/qcom,q6asm.h

···
 #define	MSM_FRONTEND_DAI_MULTIMEDIA15	14
 #define	MSM_FRONTEND_DAI_MULTIMEDIA16	15
 
+#define Q6ASM_DAI_TX_RX	0
+#define Q6ASM_DAI_TX	1
+#define Q6ASM_DAI_RX	2
+
 #endif /* __DT_BINDINGS_Q6_ASM_H__ */

sound/soc/qcom/qdsp6/q6asm-dai.c

···
 #define COMPR_PLAYBACK_MAX_FRAGMENT_SIZE (128 * 1024)
 #define COMPR_PLAYBACK_MIN_NUM_FRAGMENTS (4)
 #define COMPR_PLAYBACK_MAX_NUM_FRAGMENTS (16 * 4)
-#define Q6ASM_DAI_TX_RX	0
-#define Q6ASM_DAI_TX	1
-#define Q6ASM_DAI_RX	2
 
 #define ALAC_CH_LAYOUT_MONO   ((101 << 16) | 1)
 #define ALAC_CH_LAYOUT_STEREO ((101 << 16) | 2)