fix hclk calculate error

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

Revert "Revert "Merge branch 'feature/clk_dev' into aspeed-dev-v2019.04""

This reverts commit fd98b62831ed9249f1656f1760ddc354b2455eaa.

Revert "Merge branch 'feature/clk_dev' into aspeed-dev-v2019.04"

This reverts commit a1e27f4f7eed7f15b45d3cc85a58dc332937e46f, reversing
changes made to 65287740cbb6a73fd83be1470f38cfc573741eeb.

[update] revise mac clock control

fix clk and reset

[update] refactor the PLL configuration flow

Merge branch 'feature/revise_dram' into aspeed-dev-v2019.04

update sd clk cal

[update] add comments

fix emmc clk

add support 2 apb clk

[update] use union to parse PLL divider setting

[update] revise PLL paramter calculation.

the algorithm for calculating PLL parameters is not suitable for ast2600.
Use pre-defined lookup table to ensure all candidates of the PLL parameters
are gu

[update] revise PLL paramter calculation.

the algorithm for calculating PLL parameters is not suitable for ast2600.
Use pre-defined lookup table to ensure all candidates of the PLL parameters
are guaranteed by the IP provider.

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[update] correct MAC#3/#4 configuration

Merge branch 'feature/ast2600_mac' into aspeed-dev-v2019.04

[update] revise MAC#1/#2 delay setting

now MAC#1 and MAC#2 can execute ping command successfully.

update

[update] add MAC default delay

[update] add default PLL lookup table

[update] set MAC controller freq

[update] add MAC clock setting

update a/e/d/m/h pll

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

update clk info for ast2500/ast2600