riscv: dts: jh7110: add bootph-pre-ram for &pllclk

riscv: dts: jh7110: add bootph-pre-ram for &pllclk

Since commit f98cd471f06b ("clk: clk-composite: Resolve parent clock by
name") the StarFive VisionFive 2 board fails to boot.

Before that patch the SPL debug UART showed warnings like:

    clk_register: failed to get pll0_out device (parent of perh_root)
    clk_register: failed to get pll0_out device (parent of qspi_ref_src)
    clk_register: failed to get pll0_out device (parent of usb_125m)
    clk_register: failed to get pll0_out device (parent of gmac_src)
    clk_register: failed to get pll0_out device (parent of gmac1_gtxclk)
    clk_register: failed to get pll0_out device (parent of gmac0_gtxclk)

The &pllclk clock needs to be enabled early.

Fixes: f98cd471f06b ("clk: clk-composite: Resolve parent clock by name")
Suggested-by: Marek Vasut <marex@denx.de>
Tested-by: Yao Zi <ziyao@disroot.org>
Reviewed-by: Leo Yu-Chi Liang <ycliang@andestech.com>
Signed-off-by: Heinrich Schuchardt <heinrich.schuchardt@canonical.com>