UBUNTU: SAUCE: bnxt_en_bpo: Remove unnecessary compile flags

BugLink: http://bugs.launchpad.net/bugs/1711056

Remove the following compile flags that are set by the kernel's
Makefile:
  -g -D__LINUX
Signed-off-by: Juerg Haefliger <juerg.haefliger@canonical.com>
Acked-by: Stefan Bader <stefan.bader@canonical.com>
Acked-by: Kleber Sacilotto de Souza <kleber.souza@canonical.com>
Signed-off-by: Kleber Sacilotto de Souza <kleber.souza@canonical.com>

ubuntu/bnxt/Makefile

@@ -403,7 +403,7 @@ ifneq ($(shell ls $(LINUXSRC)/include/$(UAPI)/linux/net_tstamp.h > /dev/null 2>&
   endif
 endif
 
-EXTRA_CFLAGS += ${DISTRO_CFLAG} -g -DCHIMP_FW -D__LINUX -DCONFIG_BNXT_SRIOV -DCONFIG_BNXT_DCB -DCONFIG_BNXT_FLASHDEV -DHSI_DBG_DISABLE -DCONFIG_BNXT_RE
+EXTRA_CFLAGS += $(DISTRO_CFLAG) -DCHIMP_FW -DCONFIG_BNXT_SRIOV -DCONFIG_BNXT_DCB -DCONFIG_BNXT_FLASHDEV -DHSI_DBG_DISABLE -DCONFIG_BNXT_RE
 
 cflags-y += $(EXTRA_CFLAGS)