bcm27xx: drop upstream patch that breaks rpi5 wifi

As reported in the following issue, this patch breaks wifi on the RPi 5.
https://github.com/raspberrypi/linux/issues/6237

Signed-off-by: Álvaro Fernández Rojas <noltari@gmail.com>

target/linux/bcm27xx/patches-6.6/950-1133-drivers-mmc-sdhci-brcmstb-improve-bcm2712-card-remov.patch

@@ -1,52 +0,0 @@
-From 5c0f94088e0694220a2f0d8ad6e8216b50a80f2e Mon Sep 17 00:00:00 2001
-From: Jonathan Bell <jonathan@raspberrypi.com>
-Date: Thu, 13 Jun 2024 15:01:02 +0100
-Subject: [PATCH 1133/1135] drivers: mmc: sdhci-brcmstb: improve bcm2712 card
- removal handling
-
-If the controller is being reset, then the CQE needs to be reset as well.
-
-For removable cards, CQHCI_SSC1 must specify a polling mode (CBC=0)
-otherwise it's possible that the controller stops emitting periodic
-CMD13s on card removal, without raising an error status interrupt.
-
-Signed-off-by: Jonathan Bell <jonathan@raspberrypi.com>
----
- drivers/mmc/host/sdhci-brcmstb.c | 19 ++++++++++++++++---
- 1 file changed, 16 insertions(+), 3 deletions(-)
-
---- a/drivers/mmc/host/sdhci-brcmstb.c
-+++ b/drivers/mmc/host/sdhci-brcmstb.c
-@@ -365,8 +365,21 @@ static void sdhci_brcmstb_cqe_enable(str
- 
- 	sdhci_cqe_enable(mmc);
- 
--	/* Reset CMD13 polling timer back to eMMC specification default */
--	cqhci_writel(cq_host, 0x00011000, CQHCI_SSC1);
-+	/*
-+	 * The controller resets this register to a very short default interval
-+	 * whenever CQHCI is disabled.
-+	 *
-+	 * For removable cards CBC needs to be clear or card removal can hang
-+	 * the CQE. In polling mode, a CIT of 0x4000 "cycles" seems to produce the best
-+	 * throughput.
-+	 *
-+	 * For nonremovable cards, the specification default of CBC=1 CIT=0x1000
-+	 * suffices.
-+	 */
-+	if (mmc->caps & MMC_CAP_NONREMOVABLE)
-+		cqhci_writel(cq_host, 0x00011000, CQHCI_SSC1);
-+	else
-+		cqhci_writel(cq_host, 0x00004000, CQHCI_SSC1);
- }
- 
- static const struct cqhci_host_ops sdhci_brcmstb_cqhci_ops = {
-@@ -386,7 +399,7 @@ static struct sdhci_ops sdhci_brcmstb_op
- 	.set_clock = sdhci_bcm2712_set_clock,
- 	.set_power = sdhci_brcmstb_set_power,
- 	.set_bus_width = sdhci_set_bus_width,
--	.reset = sdhci_reset,
-+	.reset = brcmstb_reset,
- 	.set_uhs_signaling = sdhci_set_uhs_signaling,
- 	.init_sd_express = bcm2712_init_sd_express,
- };