Convert the board to use DM_PMIC instead of the legacy SPL I2C/PMIC
handling.

Changes include:
- Enable DM_PMIC, DM_PMIC_PCA9450, and SPL_DM_PMIC_PCA9450 in defconfig.
- Drop legacy SPL I2C and PMIC options.
- Remove manual I2C1 pad setup and legacy power_pca9450_init() usage.
- Use DM-based pmic_get() with the DT node "pmic@25".
- Update PMIC register programming to use struct udevice API.

Signed-off-by: Peng Fan <peng.fan@nxp.com>
Reviewed-by: Yannic Moog <y.moog@phytec.de>
Tested-by: Yannic Moog <y.moog@phytec.de>
Reviewed-by: Teresa Remmet <t.remmet@phytec.de>

Remove DECLARE_GLOBAL_DATA_PTR from files where gd is not used, and
drop the unnecessary inclusion of asm/global_data.h.

Headers should be included directly by the files that need them,
rather than indirectly via global_data.h.

Reviewed-by: Patrice Chotard <patrice.chotard@foss.st.com> #STMicroelectronics boards and STM32MP1 ram test driver
Tested-by: Anshul Dalal <anshuld@ti.com> #TI boards
Acked-by: Yao Zi <me@ziyao.cc> #TH1520
Signed-off-by: Peng Fan <peng.fan@nxp.com>

Add new imx8mp-libra-fpsc board.
Bootph tags as well as USB device tree nodes are in u-boot.dtsi for now
and will be removed when upstreamed.
The Libra i.MX 8M Plus FPSC is a single board computer. It uses an i.MX
8M Plus FPSC [1] System on Module which utilizes the FPSC standard [2].

[1] https://www.phytec.eu/en/produkte/system-on-modules/phycore-imx-8m-plus-fpsc
[2] https://www.phytec.eu/en/produkte/system-on-modules/fpsc

Signed-off-by: Benjamin Hahn <B.Hahn@phytec.de>
Reviewed-by: Teresa Remmet <t.remmet@phytec.de>
Tested-by: Teresa Remmet <t.remmet@phytec.de>
Signed-off-by: Yannic Moog <y.moog@phytec.de>