memory: omap-gpmc: remove unused file-scope phys_base and mem_size

The file-scope variables phys_base and mem_size are assigned in
gpmc_probe() but never read.

This fixes build error when compile testing on x86_64 architecture:

    drivers/memory/omap-gpmc.c:246:24: error: conflicting types for ‘phys_base’
     static resource_size_t phys_base, mem_size;
    In file included from arch/x86/include/asm/page.h:12:0,
                     from arch/x86/include/asm/thread_info.h:12,
                     from include/linux/thread_info.h:38,
                     from arch/x86/include/asm/preempt.h:7,
                     from include/linux/preempt.h:78,
                     from include/linux/spinlock.h:51,
                     from include/linux/irq.h:14,
                     from drivers/memory/omap-gpmc.c:12:
    arch/x86/include/asm/page_64.h:12:22: note: previous declaration of ‘phys_base’ was here
     extern unsigned long phys_base;
Signed-off-by: Krzysztof Kozlowski <krzk@kernel.org>
Link: https://lore.kernel.org/r/20200724074038.5597-3-krzk@kernel.org

drivers/memory/omap-gpmc.c

@@ -243,7 +243,6 @@ static DEFINE_SPINLOCK(gpmc_mem_lock);
 /* Define chip-selects as reserved by default until probe completes */
 static unsigned int gpmc_cs_num = GPMC_CS_NUM;
 static unsigned int gpmc_nr_waitpins;
-static resource_size_t phys_base, mem_size;
 static unsigned int gpmc_capability;
 static void __iomem *gpmc_base;
 
@@ -2349,9 +2348,6 @@ static int gpmc_probe(struct platform_device *pdev)
 	if (res == NULL)
 		return -ENOENT;
 
-	phys_base = res->start;
-	mem_size = resource_size(res);
-
 	gpmc_base = devm_ioremap_resource(&pdev->dev, res);
 	if (IS_ERR(gpmc_base))
 		return PTR_ERR(gpmc_base);