ar71xx: make IRQ fixes target specific

Move the IRQ fix from generic to ar71xx specific.
Other targets like ath79 have specific pathes to delete this code.
This resulted in a build failure on ath79

While at it, wipe the 4.19 version, as ar71xx will never reach this.

Fixes: 530f76708cef ("ar71xx: Fix potentially missed IRQ handling during
dispatch")

Signed-off-by: Koen Vandeputte <koen.vandeputte@ncentric.com>

target/linux/generic/pending-4.19/343-MIPS-ath79-Fix-potentially-missed-IRQ-handling-durin.patch

@@ -1,57 +0,0 @@
-From 3fe7841bf5a582dc7fd198e5bf70162ea418a22a Mon Sep 17 00:00:00 2001
-From: Koen Vandeputte <koen.vandeputte@ncentric.com>
-Date: Wed, 11 Sep 2019 11:02:19 +0200
-Subject: [PATCH] MIPS: ath79: Fix potentially missed IRQ handling during
- dispatch
-
-If both interrupts are set in the current implementation
-only the 1st will be handled and the 2nd will be skipped
-due to the "if else" condition.
-
-Fix this by using the same approach as done for QCA955x
-just below it.
-
-Fixes: fce5cc6e0ddc ("MIPS: ath79: add IRQ handling code for AR934X")
-Signed-off-by: Koen Vandeputte <koen.vandeputte@ncentric.com>
-CC: Felix Fietkau <nbd@nbd.name>
-CC: Gabor Juhos <juhosg@freemail.hu>
-CC: James Hogan <jhogan@kernel.org>
-CC: Paul Burton <paul.burton@mips.com>
-CC: Ralf Baechle <ralf@linux-mips.org>
-CC: stable@vger.kernel.org # v3.2+
----
- arch/mips/ath79/irq.c | 12 +++++++++---
- 1 file changed, 9 insertions(+), 3 deletions(-)
-
-diff --git a/arch/mips/ath79/irq.c b/arch/mips/ath79/irq.c
-index 2dfff1f19004..a03a6bcaf6fd 100644
---- a/arch/mips/ath79/irq.c
-+++ b/arch/mips/ath79/irq.c
-@@ -32,15 +32,21 @@ static void ar934x_ip2_irq_dispatch(struct irq_desc *desc)
- 	u32 status;
- 
- 	status = ath79_reset_rr(AR934X_RESET_REG_PCIE_WMAC_INT_STATUS);
-+	status &= AR934X_PCIE_WMAC_INT_PCIE_ALL | AR934X_PCIE_WMAC_INT_WMAC_ALL;
-+
-+	if (status == 0) {
-+		spurious_interrupt();
-+		return;
-+	}
- 
- 	if (status & AR934X_PCIE_WMAC_INT_PCIE_ALL) {
- 		ath79_ddr_wb_flush(3);
- 		generic_handle_irq(ATH79_IP2_IRQ(0));
--	} else if (status & AR934X_PCIE_WMAC_INT_WMAC_ALL) {
-+	}
-+
-+	if (status & AR934X_PCIE_WMAC_INT_WMAC_ALL) {
- 		ath79_ddr_wb_flush(4);
- 		generic_handle_irq(ATH79_IP2_IRQ(1));
--	} else {
--		spurious_interrupt();
- 	}
- }
- 
--- 
-2.17.1
-