clk: qcom: gcc-ipq806x: add unusued flag for critical clock

Some clocks are used by other devices present on the SoC. For example
the gsbi4_h_clk is used by RPM and is if disabled cause the RPM to
reject any regulator change command. These clock should never be
disabled.

Signed-off-by: Ansuel Smith <[e-mail]>
Tested-by: Jonathan McDowell <[e-mail]>
Signed-off-by: Bjorn Andersson <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]

drivers/clk/qcom/gcc-ipq806x.c

···
 			.parent_data = gcc_pxo_pll8,
 			.num_parents = ARRAY_SIZE(gcc_pxo_pll8),
 			.ops = &clk_rcg_ops,
-			.flags = CLK_SET_PARENT_GATE,
+			.flags = CLK_SET_PARENT_GATE | CLK_IGNORE_UNUSED,
 		},
 	},
 };
···
 			},
 			.num_parents = 1,
 			.ops = &clk_branch_ops,
-			.flags = CLK_SET_RATE_PARENT,
+			.flags = CLK_SET_RATE_PARENT | CLK_IGNORE_UNUSED,
 		},
 	},
 };
···
 			.parent_data = gcc_pxo_pll8,
 			.num_parents = ARRAY_SIZE(gcc_pxo_pll8),
 			.ops = &clk_rcg_ops,
-			.flags = CLK_SET_PARENT_GATE,
+			.flags = CLK_SET_PARENT_GATE | CLK_IGNORE_UNUSED,
 		},
 	},
 };
···
 			},
 			.num_parents = 1,
 			.ops = &clk_branch_ops,
-			.flags = CLK_SET_RATE_PARENT,
+			.flags = CLK_SET_RATE_PARENT | CLK_IGNORE_UNUSED,
 		},
 	},
 };
···
 		.hw.init = &(struct clk_init_data){
 			.name = "gsbi4_h_clk",
 			.ops = &clk_branch_ops,
+			.flags = CLK_IGNORE_UNUSED,
 		},
 	},
 };