update ast2600 for a2 apll

add ast2400 clk

add ast2400 clk

add more desciption about eMMC clk source

update axi ahb div cal

update hclk setting

update clk

clk: rsa clock source set to hpll

update sd/emmc controller source

revise mac txclk delay

set max driving strength for mac3/4

modify for ast2600a1 emmc clk source for mpll

revise mac1 delay

refine mac1 default delay

simplify the ethernet clock scheme.

Merge branch 'ryan_port' into aspeed-dev-v2019.04

# Conflicts:
# arch/arm/dts/ast2600.dtsi

[new] add usb host ehci clk

ARM: dts: aspeed: Fix UART clock selection property

Make the UART clock selection property name consistent
with that of kernel DTS.

[hotfix] uart clk source selection

[new] add ast2600 support uart clk source slection

add fsi clk enable

fix emmc error clk div

hot fix define

add huartx clk and fix uart5 clk cal

update uart clk