net/sfc: fix meson build warning with gcc

net/sfc: fix meson build warning with gcc

icc flag is causing build error with gcc, build error:
cc1: warning: unrecognized gcc debugging option: i
cc1: warning: unrecognized gcc debugging option: g
cc1: warning: unrecognized gcc debugging option: -
cc1: warning: unrecognized gcc debugging option: d
cc1: warning: unrecognized gcc debugging option: i
cc1: warning: unrecognized gcc debugging option: s
cc1: warning: unrecognized gcc debugging option: b
cc1: warning: unrecognized gcc debugging option: l
cc1: warning: unrecognized gcc debugging option: e
cc1: warning: unrecognized gcc debugging option:
cc1: warning: unrecognized gcc debugging option: 3
cc1: warning: unrecognized gcc debugging option: 6
cc1: warning: unrecognized gcc debugging option: 5
cc1: warning: unrecognized gcc debugging option: 6
cc1: warning: unrecognized command line option
‘-Wno-address-of-packed-member’

Removing icc flag completely since it is not supported right now.

Fixes: f16d0b36f816 ("drivers/net: fix icc deprecated parameter warning")

Signed-off-by: Ferruh Yigit <ferruh.yigit@intel.com>