ARM: imx_v6_v7_defconfig: add DMATEST support

Add DMATEST support and remove invalid options, such as
CONFIG_BT_HCIUART_H4 is default enabled and CONFIG_SND_SOC_IMX_WM8962
is out of date and not appear in any config file. Please refer to
Documentation/driver-api/dmaengine/dmatest.rst to test MEMCPY feature
of imx-sdma.
Signed-off-by: Robin Gong <yibin.gong@nxp.com>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>

arch/arm/configs/imx_v6_v7_defconfig

@@ -81,7 +81,6 @@ CONFIG_CAN=y
 CONFIG_CAN_FLEXCAN=y
 CONFIG_BT=y
 CONFIG_BT_HCIUART=y
-CONFIG_BT_HCIUART_H4=y
 CONFIG_BT_HCIUART_LL=y
 CONFIG_CFG80211=y
 CONFIG_CFG80211_WEXT=y
@@ -283,7 +282,6 @@ CONFIG_SND_SOC_FSL_ASRC=y
 CONFIG_SND_IMX_SOC=y
 CONFIG_SND_SOC_PHYCORE_AC97=y
 CONFIG_SND_SOC_EUKREA_TLV320=y
-CONFIG_SND_SOC_IMX_WM8962=y
 CONFIG_SND_SOC_IMX_ES8328=y
 CONFIG_SND_SOC_IMX_SGTL5000=y
 CONFIG_SND_SOC_IMX_SPDIF=y
@@ -370,6 +368,7 @@ CONFIG_DMADEVICES=y
 CONFIG_FSL_EDMA=y
 CONFIG_IMX_SDMA=y
 CONFIG_MXS_DMA=y
+CONFIG_DMATEST=m
 CONFIG_STAGING=y
 CONFIG_STAGING_MEDIA=y
 CONFIG_VIDEO_IMX_MEDIA=y