drm/amdgpu: fix i2s_pdata out of bound array access

Fixed following Smatch static checker warning:

drivers/gpu/drm/amd/amdgpu/amdgpu_acp.c:393 acp_hw_init()
error: buffer overflow 'i2s_pdata' 3 <= 3
drivers/gpu/drm/amd/amdgpu/amdgpu_acp.c:396 acp_hw_init()
error: buffer overflow 'i2s_pdata' 3 <= 3

Fixes: 4c33e5179ff1 ("drm/amdgpu: create I2S platform devices for Jadeite platform")
Reported-by: Dan Carpenter <[e-mail]>
Signed-off-by: Vijendar Mukunda <[e-mail]>
Acked-by: Alex Deucher <[e-mail]>
Signed-off-by: Alex Deucher <[e-mail]>

drivers/gpu/drm/amd/amdgpu/amdgpu_acp.c

···
 		i2s_pdata[2].i2s_reg_comp1 = ACP_BT_COMP1_REG_OFFSET;
 		i2s_pdata[2].i2s_reg_comp2 = ACP_BT_COMP2_REG_OFFSET;
 
-		i2s_pdata[3].quirks = DW_I2S_QUIRK_COMP_REG_OFFSET;
-		switch (adev->asic_type) {
-		case CHIP_STONEY:
-			i2s_pdata[3].quirks |= DW_I2S_QUIRK_16BIT_IDX_OVERRIDE;
-			break;
-		default:
-			break;
-		}
 		adev->acp.acp_res[0].name = "acp2x_dma";
 		adev->acp.acp_res[0].flags = IORESOURCE_MEM;
 		adev->acp.acp_res[0].start = acp_base;