net: stmmac: dwc-qos: remove tegra_eqos_init()

net: stmmac: dwc-qos: remove tegra_eqos_init()

tegra_eqos_init() initialises the 1US TIC counter for the EEE timers.
However, the DWGMAC core is reset after this write, which clears
this register to its default.

However, dwmac4_core_init() configures this register using the same
clock, which happens after reset - thus this is the write which
ensures that the register is correctly configured.

Therefore, tegra_eqos_init() is not required and is removed. This also
means eqos->clk_slave can also be removed.

Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk>
Link: https://patch.msgid.link/E1u3Vuf-000E7g-U4@rmk-PC.armlinux.org.uk
Signed-off-by: Jakub Kicinski <kuba@kernel.org>