qlge: Get rid of volatile usage for shadow register.

Putting back ql_read_sh_reg() function and using rmb() instead of
volatile.

Signed-off-by: Ron Mercer <ron.mercer@qlogic.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --cc drivers/net/qlge/qlge.h
Simple merge

diff --cc drivers/net/qlge/qlge_dbg.c
Simple merge

diff --cc drivers/net/qlge/qlge_main.c
Simple merge