airoha: make files 5.15 only

Contents of the files folder were upstreamed in 6.1 so make it 5.15 only.

Signed-off-by: Robert Marko <robimarko@gmail.com>

diff --git a/target/linux/airoha/files/arch/arm/mach-airoha/Makefile b/target/linux/airoha/files-5.15/arch/arm/mach-airoha/Makefile
similarity index 100%
rename from target/linux/airoha/files/arch/arm/mach-airoha/Makefile
rename to target/linux/airoha/files-5.15/arch/arm/mach-airoha/Makefile

diff --git a/target/linux/airoha/files/arch/arm/mach-airoha/airoha.c b/target/linux/airoha/files-5.15/arch/arm/mach-airoha/airoha.c
similarity index 100%
rename from target/linux/airoha/files/arch/arm/mach-airoha/airoha.c
rename to target/linux/airoha/files-5.15/arch/arm/mach-airoha/airoha.c

diff --git a/target/linux/airoha/files/drivers/clk/clk-en7523.c b/target/linux/airoha/files-5.15/drivers/clk/clk-en7523.c
similarity index 100%
rename from target/linux/airoha/files/drivers/clk/clk-en7523.c
rename to target/linux/airoha/files-5.15/drivers/clk/clk-en7523.c

diff --git a/target/linux/airoha/files/drivers/gpio/gpio-en7523.c b/target/linux/airoha/files-5.15/drivers/gpio/gpio-en7523.c
similarity index 100%
rename from target/linux/airoha/files/drivers/gpio/gpio-en7523.c
rename to target/linux/airoha/files-5.15/drivers/gpio/gpio-en7523.c

diff --git a/target/linux/airoha/files/include/dt-bindings/clock/en7523-clk.h b/target/linux/airoha/files-5.15/include/dt-bindings/clock/en7523-clk.h
similarity index 100%
rename from target/linux/airoha/files/include/dt-bindings/clock/en7523-clk.h
rename to target/linux/airoha/files-5.15/include/dt-bindings/clock/en7523-clk.h