dmaengine: INTEL_LDMA should depend on X86

The Intel Lightning Mountain (LGM) DMA controller is only present on
Intel Lightning Mountain SoCs.  Hence add a dependency on X86, to
prevent asking the user about this driver when configuring a kernel
without Intel Lightning Mountain platform support.

While at it, fix a misspelling of "Intel".

Fixes: 32d31c79 ("dmaengine: Add Intel LGM SoC DMA support.")
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Link: https://lore.kernel.org/r/20210129131702.2656060-1-geert+renesas@glider.beSigned-off-by: Vinod Koul <vkoul@kernel.org>

drivers/dma/lgm/Kconfig

 # SPDX-License-Identifier: GPL-2.0-only
 config INTEL_LDMA
 	bool "Lightning Mountain centralized DMA controllers"
+	depends on X86 || COMPILE_TEST
 	select DMA_ENGINE
 	select DMA_VIRTUAL_CHANNELS
 	help
-	  Enable support for intel Lightning Mountain SOC DMA controllers.
+	  Enable support for Intel Lightning Mountain SOC DMA controllers.
 	  These controllers provide DMA capabilities for a variety of on-chip
 	  devices such as HSNAND and GSWIP (Gigabit Switch IP).