fixup! pcie-brcmstb: move the unilateral disable of CLKREQ# before link-up

* Fixes build with Clang.

drivers/pci/controller/pcie-brcmstb.c:1595:3: error: variable 'clkreq_cntl' is uninitialized when used here [-Werror,-Wuninitialized]
 1595 |                 clkreq_cntl |= PCIE_MISC_HARD_PCIE_HARD_DEBUG_CLKREQ_DEBUG_ENABLE_MASK;
      |                 ^~~~~~~~~~~
drivers/pci/controller/pcie-brcmstb.c:1578:17: note: initialize the variable 'clkreq_cntl' to silence this warning
 1578 |         u32 clkreq_cntl;
      |                        ^
      |                         = 0
1 error generated.

Author: KonstaT

drivers/pci/controller/pcie-brcmstb.c

@@ -1575,7 +1575,7 @@ static void brcm_config_clkreq(struct brcm_pcie *pcie)
 {
 	static const char err_msg[] = "invalid 'brcm,clkreq-mode' DT string\n";
 	const char *mode = "default";
-	u32 clkreq_cntl;
+	u32 clkreq_cntl = 0;
 	int ret, tmp;
 
 	ret = of_property_read_string(pcie->np, "brcm,clkreq-mode", &mode);