u-boot-aspeed: Disable unnecessary features

Allow platforms to opt into the u-boot patch disabling unnecessary
hardware features for ASPEED SoCs.

As this change touches bits tha

u-boot-aspeed: Disable unnecessary features

Allow platforms to opt into the u-boot patch disabling unnecessary
hardware features for ASPEED SoCs.

As this change touches bits that were not initialised by previous u-boot
revisions and the configuration applied prevents poweron of OpenPOWER
hosts without corresponding host firmware changes, this change is
nohwci.

(From meta-phosphor rev: 82f2db28ad8f4f0b7fbf703e8942afcaf6e70a2b)

Change-Id: I2f40a780afe539e9e4ff13983cd567e849bbed25
Signed-off-by: Andrew Jeffery <andrew@aj.id.au>
Signed-off-by: Brad Bishop <bradleyb@fuzziesquirrel.com>

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