[PATCH v2] MIPS: Octeon: apply USB FDT fixups also when USB is modular

[Orgad Shaneh <orgads@gmail.com>]

The uctl/usbn device-tree fixups in octeon_prune_device_tree() - which
set the board's USB reference-clock frequency and type from
__cvmx_helper_board_usb_get_clock_type() - are guarded by
"#ifdef CONFIG_USB", which is false when USB is built as a module. The
fixups then silently disappear and octeon-hcd sees whatever default the
DTS carries (12MHz crystal in octeon_3xxx.dts), leaving the PHY dead or
the bus erroring on boards with a different reference clock.

Use IS_ENABLED() so USB=m gets the same fixups as USB=y.

Fixes: 7fd57ab9d9cf ("MIPS: Octeon: Fix compile error when USB is not enabled.")
Assisted-by: Claude:claude-opus-5
Signed-off-by: Orgad Shaneh <orgads@gmail.com>
---

v2: no code change; added the Assisted-by tag for the AI assistance used
    (Documentation/process/coding-assistants.rst).

diff --git a/arch/mips/cavium-octeon/octeon-platform.c b/arch/mips/cavium-octeon/octeon-platform.c
--- a/arch/mips/cavium-octeon/octeon-platform.c
+++ b/arch/mips/cavium-octeon/octeon-platform.c
@@ -18,7 +18,7 @@
 #include <asm/octeon/octeon.h>
 #include <asm/octeon/cvmx-helper-board.h>
 
-#ifdef CONFIG_USB
+#if IS_ENABLED(CONFIG_USB)
 #include <linux/usb/ehci_def.h>
 #include <linux/usb/ehci_pdriver.h>
 #include <linux/usb/ohci_pdriver.h>
@@ -1080,7 +1080,7 @@
 		;
 	}
 
-#ifdef CONFIG_USB
+#if IS_ENABLED(CONFIG_USB)
 	/* OHCI/UHCI USB */
 	alias_prop = fdt_getprop(initial_boot_params, aliases,
 				 "uctl", NULL);
-- 
2.47.0