drm/msm/mdp4: add lcdc-align-lsb flag to control lane alignment

Optional properties:

- clock-names: the following clocks are optional:

  * "lut_clk"

- qcom,lcdc-align-lsb: Boolean value indicating that LSB alignment should be

  used for LCDC. This is only valid for 18bpp panels.

Example:

	unsigned long pc = mdp4_lcdc_encoder->pixclock;

	struct mdp4_kms *mdp4_kms = get_kms(encoder);

	struct drm_panel *panel;

	uint32_t config;

	int i, ret;

	if (WARN_ON(mdp4_lcdc_encoder->enabled))

		return;

	/* TODO: hard-coded for 18bpp: */

	mdp4_crtc_set_config(encoder->crtc,

	config =

		MDP4_DMA_CONFIG_R_BPC(BPC6) |

		MDP4_DMA_CONFIG_G_BPC(BPC6) |

		MDP4_DMA_CONFIG_B_BPC(BPC6) |

			MDP4_DMA_CONFIG_PACK_ALIGN_MSB |

		MDP4_DMA_CONFIG_PACK(0x21) |

		MDP4_DMA_CONFIG_DEFLKR_EN |

			MDP4_DMA_CONFIG_DITHER_EN);

		MDP4_DMA_CONFIG_DITHER_EN;

	if (!of_property_read_bool(dev->dev->of_node, "qcom,lcdc-align-lsb"))

		config |= MDP4_DMA_CONFIG_PACK_ALIGN_MSB;

	mdp4_crtc_set_config(encoder->crtc, config);

	mdp4_crtc_set_intf(encoder->crtc, INTF_LCDC_DTV, 0);

	bs_set(mdp4_lcdc_encoder, 1);