fm10k: do not clear global mailbox interrupt bits

Partially revert commit 5e93cba ("fm10k: Reset mailbox global
interrupts", 2016-06-07)

The register bits related to this commit are now solely being handled by
the IES API. Recent changes in the IES API will allow an automatic
recovery from improper handling of these bits.

Signed-off-by: Ngai-Mint Kwan <ngai-mint.kwan@intel.com>
Signed-off-by: Jacob Keller <jacob.e.keller@intel.com>
Tested-by: Krishneil Singh <krishneil.k.singh@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>

drivers/net/ethernet/intel/fm10k/fm10k_pf.c

@@ -72,10 +72,6 @@ static s32 fm10k_reset_hw_pf(struct fm10k_hw *hw)
 	fm10k_write_flush(hw);
 	udelay(FM10K_RESET_TIMEOUT);
 
-	/* Reset mailbox global interrupts */
-	reg = FM10K_MBX_GLOBAL_REQ_INTERRUPT | FM10K_MBX_GLOBAL_ACK_INTERRUPT;
-	fm10k_write_reg(hw, FM10K_GMBX, reg);
-
 	/* Verify we made it out of reset */
 	reg = fm10k_read_reg(hw, FM10K_IP);
 	if (!(reg & FM10K_IP_NOTINRESET))