misc: bphy: Get max irq number from firmware

commit e3edf68b7f584a4a7ab9f560f38e05f335df3eb7 from
git@git.assembla.com:cavium/WindRiver.linux.git

The driver learns maximum number of interrupts from ATF and
uses this value for runtime resources allocation and may
forward this value to driver users via ioctl().

Change-Id: Ia6f3a1ff6c7ef22ca0376e73da9a550e73d3d56f
Signed-off-by: Jakub Palider <jpalider@marvell.com>
Reviewed-on: https://sj1git1.cavium.com/c/IP/SW/kernel/linux/+/45892


Tested-by: sa_ip-sw-jenkins <sa_ip-sw-jenkins@marvell.com>
Reviewed-by: Jerin Jacob Kollanukkaran <jerinj@marvell.com>
Reviewed-by: Sunil Kovvuri Goutham <Sunil.Goutham@cavium.com>
Reviewed-on: https://sj1git1.cavium.com/c/IP/SW/kernel/linux/+/47714


Reviewed-by: Naveen Mamindlapalli <Naveen.Mamindlapalli@cavium.com>
Signed-off-by: Ruiqiang Hao <Ruiqiang.Hao@windriver.com>