Merge branch 'net-dsa-Global-2-cosmetics'

Vivien Didelot says:

====================
net: dsa: Global 2 cosmetics

Similarly to what has been done for the Port and Global 1 registers,
this patch series prefixes and documents the macros of Global 2.

It brings no functional changes except for 1/10 which fixes the IRL init
for 88E6390 family.

Changes in v2: make *_g2_irl_init_all static inline without
NET_DSA_MV88E6XXX_GLOBAL2 and compile test with and without the symbol.
====================

Signed-off-by: David S. Miller <davem@davemloft.net>