net: stmmac: use STMMAC_CSR_xxx definitions in platform glue

Use the STMMAC_CSR_xxx definitions to initialise plat->clk_csr in the
platform glue drivers to make the integer values meaningful.

Signed-off-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Tested-by: Mohd Ayaan Anwar <quic_mohdayaa@quicinc.com>
Link: https://patch.msgid.link/E1uu8oh-00000001vpT-0vk2@rmk-PC.armlinux.org.uk


Signed-off-by: Jakub Kicinski <kuba@kernel.org>