net: aquantia: Fix register definitions to linux style

Original driver code had internal registers and masks declarations
in low case and without any prefix.
Here we make all these uppercase and add already used HW_ATL prefix
to recognize these.

Signed-off-by: Igor Russkikh <igor.russkikh@aquantia.com>
Signed-off-by: David S. Miller <davem@davemloft.net>