drivers: Replace zephyr_library with zephyr_library_amend

Replace zephyr_library() with zephyr_library_amend() to silent a build
warning like the following:

    CMake Warning at .../scsat1-fsw/workspace/zephyr/CMakeLists.txt:915 (message):
      No SOURCES given to Zephyr library: drivers__pwm

      Excluding target from build.

    CMake Warning at .../scsat1-fsw/workspace/zephyr/CMakeLists.txt:915 (message):
      No SOURCES given to Zephyr library: drivers__spi

      Excluding target from build.

This commit does not include drivers/misc. zephyr/driver/misc doesn't
call zephyr_library(). Thus, "No SOURCES" warning will not be
generated.

Signed-off-by: Yasushi SHOJI <yashi@spacecubics.com>

drivers/can/CMakeLists.txt

@@ -1,6 +1,6 @@
 # Copyright (c) 2023 Space Cubics, LLC.
 # SPDX-License-Identifier: Apache-2.0
 
-zephyr_library()
+zephyr_library_amend()
 
 zephyr_library_sources_ifdef(CONFIG_CAN_SCCAN can_sccan.c)

drivers/i2c/CMakeLists.txt

@@ -1,6 +1,6 @@
 # Copyright (c) 2023 Space Cubics, LLC.
 # SPDX-License-Identifier: Apache-2.0
 
-zephyr_library()
+zephyr_library_amend()
 
 zephyr_library_sources_ifdef(CONFIG_I2C_SC i2c_sc.c)

drivers/pwm/CMakeLists.txt

@@ -1,6 +1,6 @@
 # Copyright (c) 2023 Space Cubics, LLC.
 # SPDX-License-Identifier: Apache-2.0
 
-zephyr_library()
+zephyr_library_amend()
 
 zephyr_library_sources_ifdef(CONFIG_PWM_SC pwm_sc.c)

drivers/spi/CMakeLists.txt

@@ -1,5 +1,5 @@
 # SPDX-License-Identifier: Apache-2.0
 
-zephyr_library()
+zephyr_library_amend()
 zephyr_library_include_directories(${ZEPHYR_BASE}/drivers/spi)
 zephyr_library_sources_ifdef(CONFIG_SPI_SC_QSPI spi_sc.c)