drivers: ambiq: Add dependencies to avoid showing to non-ambiq platforms

Fixed the Kconfig.ambiq under i2c and spi so that they don't litter.

(cherry picked from commit d1eea36)

Original-Signed-off-by: Hao Luo <hluo@ambiq.com>
GitOrigin-RevId: d1eea36
Change-Id: Ib6d09fed27b24b12f6b8ef63fe7d15360b9257b4
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/third_party/zephyr/+/5666212
Reviewed-by: Ting Shen <phoenixshen@chromium.org>
Tested-by: Ting Shen <phoenixshen@chromium.org>
Tested-by: ChromeOS Prod (Robot) <chromeos-ci-prod@chromeos-bot.iam.gserviceaccount.com>
Commit-Queue: Ting Shen <phoenixshen@chromium.org>

drivers/i2c/Kconfig.ambiq

@@ -5,7 +5,7 @@
 # SPDX-License-Identifier: Apache-2.0
 #
 
-config I2C_AMBIQ
+menuconfig I2C_AMBIQ
  bool "AMBIQ I2C driver"
  default y
  depends on DT_HAS_AMBIQ_I2C_ENABLED
@@ -14,6 +14,8 @@ config I2C_AMBIQ
  help
  Enable driver for Ambiq I2C.
 
+if I2C_AMBIQ
+
 config I2C_AMBIQ_DMA
  bool "AMBIQ APOLLO I2C DMA Support"
  help
@@ -24,3 +26,5 @@ config I2C_DMA_TCB_BUFFER_SIZE
  default 1024
  help
  DMA Transfer Control Buffer size in words
+
+endif # I2C_AMBIQ

drivers/spi/Kconfig.ambiq

@@ -6,7 +6,7 @@
 # SPDX-License-Identifier: Apache-2.0
 #
 
-config SPI_AMBIQ
+menuconfig SPI_AMBIQ
  bool "AMBIQ SPI driver"
  default y
  depends on DT_HAS_AMBIQ_SPI_ENABLED
@@ -15,6 +15,8 @@ config SPI_AMBIQ
  help
  Enable driver for Ambiq SPI.
 
+if SPI_AMBIQ
+
 config SPI_AMBIQ_DMA
  bool "AMBIQ APOLLO SPI DMA Support"
  depends on SPI_AMBIQ
@@ -28,6 +30,8 @@ config SPI_DMA_TCB_BUFFER_SIZE
  help
  DMA Transfer Control Buffer size in words
 
+endif # SPI_AMBIQ
+
 config MSPI_AMBIQ
  bool "AMBIQ MSPI driver"
  default y