at91: kernel v5.15: copy config and patches from 5.10

Copy kernel config and patches from 5.10. Along with it
individual targets' config-default from 5.10 has been moved to
config-5.10.

Signed-off-by: Claudiu Beznea <claudiu.beznea@microchip.com>

target/linux/at91/patches-5.15/121-ASoC-pcm5102a-Make-codec-selectable.patch

@@ -0,0 +1,28 @@
+From 5ac0e1f5577b266543756521b1a749003b0f3686 Mon Sep 17 00:00:00 2001
+From: Codrin Ciubotariu <codrin.ciubotariu@microchip.com>
+Date: Mon, 12 Oct 2020 17:19:11 +0300
+Subject: [PATCH 121/247] ASoC: pcm5102a: Make codec selectable
+
+The TI PCM5102A codec driver can be used with the generic sound card
+drivers, so it should be selectable. For example, with the addition
+of #sound-dai-cells = <0> property in DT, it can be used with simple/graph
+card drivers.
+
+Signed-off-by: Codrin Ciubotariu <codrin.ciubotariu@microchip.com>
+Link: https://lore.kernel.org/r/20201012141911.3150996-1-codrin.ciubotariu@microchip.com
+Signed-off-by: Mark Brown <broonie@kernel.org>
+---
+ sound/soc/codecs/Kconfig | 2 +-
+ 1 file changed, 1 insertion(+), 1 deletion(-)
+
+--- a/sound/soc/codecs/Kconfig
++++ b/sound/soc/codecs/Kconfig
+@@ -1007,7 +1007,7 @@ config SND_SOC_PCM3168A_SPI
+ 	select REGMAP_SPI
+ 
+ config SND_SOC_PCM5102A
+-	tristate
++	tristate "Texas Instruments PCM5102A CODEC"
+ 
+ config SND_SOC_PCM512x
+ 	tristate