tests: drivers: add fracn test for stm32h7 clock configuration tests

/*

 * Copyright (c) 2024 Kickmaker

 *

 * SPDX-License-Identifier: Apache-2.0

 */

/*

 * Warning: This overlay performs configuration from clean sheet.

 * It is assumed that it is applied after clear_clocks.overlay file.

 */

&clk_hsi {

	hsi-div = <1>;		/* HSI RC: 64MHz, hsi_clk = 64MHz */

	status = "okay";

};

&pll {

	div-m = <4>;

	mul-n = <34>;

	div-p = <1>;

	div-q = <4>;

	div-r = <2>;

	clocks = <&clk_hsi>;

	fracn = <3072>;

	status = "okay";

};

&rcc {

	clocks = <&pll>;

	clock-frequency = <DT_FREQ_M(550)>;

	d1cpre = <1>;

	hpre = <2>;

	d1ppre = <2>;

	d2ppre1 = <2>;

	d2ppre2 = <2>;

	d3ppre = <2>;

};

      - stm32h735g_disco

    integration_platforms:

      - nucleo_h723zg

  drivers.clock.stm32_clock_configuration.h7_core.sysclksrc_pll_hsi_fracn_550:

    extra_args: DTC_OVERLAY_FILE="boards/clear_clocks.overlay;boards/pll_hsi_fracn_550.overlay"

    platform_allow:

      - nucleo_h723zg

      - stm32h735g_disco

    integration_platforms:

      - nucleo_h723zg