lib, linux: move linux specific defines to linux/compat.h

- move linux specific defines from usb and video code
  into linux/compat.h
- move common linux specific defines from include/ubi_uboot.h
  to linux/compat.h
- add for new mtd/ubi/ubifs sync new needed linux specific
  defines to linux/compat.h

Signed-off-by: Heiko Schocher <hs@denx.de>
Cc: Marek Vasut <marex@denx.de>
Cc: Anatolij Gustschin <agust@denx.de>
[trini: Add spin_lock_irqsave/spin_unlock_irqrestore dummies from
usb/lin_gadet_compat.h]
Signed-off-by: Tom Rini <trini@ti.com>

lib/linux_compat.c

@@ -0,0 +1,47 @@
+
+#include <common.h>
+#include <linux/compat.h>
+
+struct p_current cur = {
+	.pid = 1,
+};
+__maybe_unused struct p_current *current = &cur;
+
+unsigned long copy_from_user(void *dest, const void *src,
+		     unsigned long count)
+{
+	memcpy((void *)dest, (void *)src, count);
+	return 0;
+}
+
+void *kmalloc(size_t size, int flags)
+{
+	return memalign(ARCH_DMA_MINALIGN, size);
+}
+
+void *kzalloc(size_t size, int flags)
+{
+	void *ptr = kmalloc(size, flags);
+	memset(ptr, 0, size);
+	return ptr;
+}
+
+void *vzalloc(unsigned long size)
+{
+	return kzalloc(size, 0);
+}
+
+struct kmem_cache *get_mem(int element_sz)
+{
+	struct kmem_cache *ret;
+
+	ret = memalign(ARCH_DMA_MINALIGN, sizeof(struct kmem_cache));
+	ret->sz = element_sz;
+
+	return ret;
+}
+
+void *kmem_cache_alloc(struct kmem_cache *obj, int flag)
+{
+	return memalign(ARCH_DMA_MINALIGN, obj->sz);
+}